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Niama-Reisser CHB-Evo - Torque

A “one-cycle” diesel engine designed to get 200 mpg

Jan 26, 2015
Photographers: KJ Jones, Courtesy of Niama-Reisser
The annual SEMA Show is known for having all sorts of wild creations on display, but this modular 1.0L “one-cycle,” two-cylinder, Niama-Reisser CHB-Evo diesel engine really caught our attention. We’ve heard about this circular powerplant for years, but it was our first chance to see one up close. To call it “different” seems like a major understatement. The engine is not only a departure from the traditional design of a diesel—it’s a whole new take on how to harness the power of internal combustion with pistons.
As you can tell by the photos, the CHB-Evo is a very unique design that’s been described as a “Centrifugal Heinz Boxer” and named after the inventor, Heinz Reisser. Unlike the layouts of V, inline, or traditional boxer engines, the CHB-Evo has dual circular “torus” combustion chambers that surround the crankshaft located at the central axis of the engine. The engineers at Niama-Reisser say this design results in a 22 percent increase in efficiency compared to conventional designs. This is along with a 40 percent reduction in the engine footprint, and a 60 percent reduction in parts count—not to mention a 27 percent increase in thermal efficiency thanks to ceramic composite parts (which allow it to run without any lubricating engine oil) and 5 percent lower emissions. Plus, multiple engine units can be stacked together to combine their diesel power.
Photo 2/3   |   The Niama-Reisser NR-1 is designed to cruise at 70 mph and get 200 mpg while transporting four people in comfort. The fiberglass body and tubular frame are engineered for maximum cargo and passenger capacity without sacrificing roll resistance or crash safety.
The CHB-Evo works by using direct injections that occur when the opposing pistons are closing in on each other. The forced induction is provided by both a beltdriven centrifugal supercharger and an exhaust-driven turbocharger. The charge air introduced pushes out the exhaust fumes from the previous combustion just before the fresh air is compressed in between the two pistons as diesel is being injected. This same process happens simultaneously on the other side of the crankshaft, providing a complimentary compression motion on the other side of the “torus” in a back-and-forth motion to maximize efficiency. It can be hard to wrap your mind around this type of operation, but thankfully, Niama-Reisser LLC has posted animation on its website and videos on YouTube.
The company has designed a “Supermileage Vehicle” called the NR-1 around the 1.0L two-cylinder CHB-Evo engine that makes 130 hp and 220 lb-ft of torque. The fiberglass-bodied car sits on a full tube chassis with proprietary independent front and rear suspension designs that were engineered to keep the cabin as spacious as possible. Niama-Reisser says the NR-1 will be able to seat four people and reach up to 200 mpg (even with the air conditioning running) and, with a 5-gallon fuel tank, that means it has a range of up to 1,000 miles between fill-ups.
Photo 3/3   |   Chb Evo Niama Reisser 2
Specifications
Engine: CHB-Evo
Displacement: 1.0L (61 ci)
Engine layout: Opposing piston “Centrifugal Heinz Boxer”
Power: 130 hp
Torque: 220 lb-ft
Bore x Stroke: 2.76 inches (70 mm) x radial arc of approx. 60 degrees
Compression ratio: 18:1
Fuel injection: Bosch common-rail
Fuel injection pressure: 11,600 psi (800 bar)
Valvetrain: None
Induction: Exhaust-driven turbo and beltdriven supercharger
Aftercooling: Proprietary air storage system with air-to-air intercooling
Cylinder liners: Cast-iron alloy
Block material: Steel alloy
Piston material: Proprietary NR-ceramic
Oil capacity: Viscous liquid cooling approx. 7 Liters
Minimum fuel consumption: 1.75 to 3 mm³
Electrical system: 12 volts with custom ECU
Starter motor: 12-volt gear reduction starter
Engine length: 16 inches
Engine width: 22 inches diameter
Engine weight: 220 pounds without accessories

Sources

Niama-Reisser
877-829-2419
http://www.niamareisser.com
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